Positive displacement pump

ABSTRACT

A reversible reciprocating mechanism has a single crankshaft and geometrical equilateral shapes to organize positive displacement reciprocating movement with liquid movement for pumping or energy recovery systems.

TECHNICAL FIELD

[0001] This invention is related to “a positive displacement pump” modification. The invention subject is about modification of conventional reciprocating pump design to use a single crankshaft regardless of the number of pistons. It also explains how to reverse the pump cycle to use the liquid to create a rotating movement as a mechanical power generating.

INVENTION BACKGROUND

[0002] From the conventional type of pumps is the positive displacement pump. The theory of this type is to use a crank shaft to drive a group of pistons to create suction and discharge effect across a group of one way valves.

[0003] Due to the crank problems related to the oil existence which causes pollution, the difficulty of manufacturing and the traditional way of manufacturing the positive displacement pump as one mass causing the difficulty of removing the one way valves as you have to disassemble a part of the pumps, the inventor idea was briefed on modifying manufacturing method to avoid these problems. The modification mentioned later on the claims to be protected lead to:

[0004] 1. The conventional crankshaft is replaced by a single crankshaft regardless of the number of pistons.

[0005] 2. Installation of the one way valves independently for easy removing without disassembling any part of the pump.

[0006] 3. Use this arrangement to reverse the pump motion

INVENTION DESCRIPTION

[0007] All the positive displacement pumps get the reciprocating movements from the crankshaft. And the number of piston is determined upon the crankshaft angle.

[0008] A new method was invented to cancel the multi crankshaft and to reverse the pump motion to use it as an energy recovery system. The detailed description is summarized in:

[0009] 1. The Way of Manufacturing the Liquid End:

[0010] Due to the problems on the liquid end which is limited from the point of view of the inventor on the difficulty of removing the single way valve and, the manufacturing of the liquid end as a single mass, this way was invented to replace this mass with simple parts joined together through victaulic coupling.

[0011] These lead to an easy way of manufacturing and maintenance.

[0012] FIG. (1) shows that the parts required to manufacture the liquid end are:

[0013] 3 Tee shown as part 1-2-3

[0014] 2 one way valves shown as part 4-5 (note: the valves are manufactured in a way that they are installed using victaulic coupling shown as part 6-7-8-9 to simplify maintenance)

[0015] Piston case shown as part 10

[0016] These parts are used together for each piston separately not as conventional way using a single mass with the valves installed inside. From this way we notice:

[0017] 1-Easy maintenance to replace valves.

[0018] 2-Easy manufacturing system.

[0019] 2-The Way of Manufacturing the Alternative Parts Instead of the Traditional Oil End.

[0020] Due to the problems found in this part from oil existence causing environmental pollution and the high load on the crankshaft limiting the pump r.p.m., the inventor found that replacing the traditional way of manufacturing the oil end by a single crankshaft using rolling bearing will solve the oil existence and the stress of the crankshaft.

[0021] Also the inventor found using a geometrical equilateral shape as an equilateral triangle lead to get the reciprocating movement of a triple crankshaft. Also changing the geometrical shape by any equilateral shape, lead to a crank movement similar to the number of sides.

[0022] The figure explains the way of manufacturing of the pumps without using the traditional crankshaft in a condition to use the above mentioned liquid end manufacturing way. FIG. 2, 3 shows the way of manufacturing to get a reciprocating movement from a single crankshaft using Rolling baring instead of an oil end.

[0023] A triangle shape was used to explain the theory. The traditional crankshaft was replaced as explained above by a single crank and a triangle shape as shown in FIG. (2) was responsible to create a reciprocating movement similar to a triplex pump.

[0024] To transfer the rotating movement to reciprocating movement a motor was connected to a single crankshaft where the distance between the center of the rotating movement and the center of the rolling bearing is equal to ½ the stroke as shown in FIG. (3).

[0025] The rolling bearing and the connecting rod transfer the rotating movement to a reciprocating movement and the triangle shape is responsible of organizing the reciprocating movement to be similar to the movement of a 3 piston pump.

[0026] Remarks:

[0027] One of the main advantages of this method is the short length of the single crankshaft and usage of the ball bearing which help a lot on exceeding the rotating speed (r.p.m) and preventing the oil usage.

[0028] The Reverse of the Pump Movement to Use it as an Energy Recovery

[0029] The manufacturing method mentioned above helps us in this application. In reciprocating engine, the transfer of the reciprocating to rotating movement is controlled and organized by what we called “cam rod” that is difficult to use it with an application working with a fluid.

[0030] The idea is briefed as shown in FIG. (4) as to transfer the reciprocating movement to a rotating movement the one-way valves (which are responsible for the liquid entry) should be canceled and replaced by a multi outlet rotating valve. This new valve could be installed on the motor axe or could work with separate drive.

[0031] For example: An electrical motor with a speed of 1500 r.p.m could drive this multi valve with single inlet and multi outlet equivalent to the piston numbers. The drive speed is equal to the speed required for the rotating movement as the valve will run with a speed of 1500 r.p.m allowing the fluid to come inside every piston 1500 times per minute and pushes it down creating a rotating movement resulting due to the existing of the liquid outlet at the lower part of the piston as it is shown in the following figure.

[0032] The figure explains the idea of the valve with triple outlet to be suitable for creating a rotating movement with a 3 piston installation. 

1- Manufacturing way of the liquid end as separate parts. 2- Using a single crankshaft and a geometrical equilateral shapes to create an organized reciprocating movement. 3- Reversing the reciprocating pump movement in order to use it as an energy recovery system. 